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Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Components Of Net Periodic Pension Cost
The components of net periodic pension cost (income) of the UK Plan for the three and nine months ended September 30, 2021 and 2020 were as follows (in thousands): 
 For the three months ended
September 30,
For the nine months ended
September 30,
 2021202020212020
Interest cost$1,333 $1,613 $4,019 $4,765 
Expected return on plan assets(3,185)(3,030)(9,600)(8,949)
Amortization of unrecognized loss911 602 2,746 1,778 
Net periodic pension cost (income)$(941)$(815)$(2,835)$(2,406)